In the past week or so, I've noticed some dirt in the external screen on my touch. I can tell that it is under the screen, but it looks like it is in multiple layers. Is there any way that I could remove the screen to clean the dust out or somethng? If not, do you think that this would be covered by Verizon as a defect? There are no other problems with my phone, just the dust jndr the screen.